Background   I first came across Rhapsodio, a boutique IEM maker based in Hong Kong, back in May 2013.  I purchased their RDB+ v1 hybrid then, which is rather fun-sounding.  After a year or so, I thought I needed a more neutral-sounding pair of IEM, so I contacted Sammy again to check out his offerings.  Lo’ and behold, the great customer service from Sammy and the great experience with RDB+ v1 convinced me to purchase the Reference One Titanium (RTi1; single DD).   I felt that it suited most of my listening needs (e.g., covering genres like...